body {
  background: #cecdfc;
  margin: 0;
}
#tz {
  margin-top: 57px;
  margin-bottom: 10px;
}
#tz1 img {
  width: 100%;
  height: 500px;
}
#tz2 img {
  width: 100%;
  height: 200px;
}
.list-group img {
  width: 100%;
  height: 400px;
  margin-top: 50px;
}
#tz2 {
  background: white;
  text-align: center;
  height: 500px;
}
#tz3 {
  background: #f1fafa;
}
#tz4 img {
  width: 80%;
}
#foot {
  margin-top: 10px;
  text-align: center;
}
